add pwnable.kr random + rename input.py -> pwnable-kr-input.py

Author: programmeruser2

Diff for: input.py renamed to pwnable-kr-input.py

@@ -0,0 +1,7 @@
+from pwn import *
+s = ssh(host='pwnable.kr', port=2222, user='random', password='guest')
+p = s.process('./random')
+p.writeline(str(0xdeadbeef ^ 0x6b8b4567).encode('ascii')) 
+# 0x6b8b4567 is default value generated by rand() without a user provided seed
+# the default rand() seed is 1
+p.interactive()